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Alfredo User

@alfredouser5

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Full-stack Engineer at One Core Teknologi Indonesia building Meta messaging integrations and an omnichannel inbox.

Indonesia

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At One Core Teknologi Indonesia, I built WhatsApp Cloud API integrations as a Meta Tech Provider, including Embedded Signup onboarding, Coexistence, Calling API, and webhook processing. I also developed an omnichannel inbox for WhatsApp, Instagram DM, and Facebook Messenger with automatic lead capture and an auto-reply bot.

I integrated Meta Ads features and secured Meta App Review approvals for production. My work spans Go backend services with PostgreSQL and Redis, and React and TypeScript frontends.

Experience

Work history, roles, and key accomplishments

Current

Full-stack Engineer – Go & React

Current

One Core Teknologi Indonesia

Sep 2025 - Present (1 year 1 month)

Built WhatsApp Cloud API integration as a Meta Tech Provider, including Embedded Signup, Calling API, and webhook processing. Developed an omnichannel inbox for WhatsApp, Instagram DM, and Facebook Messenger with lead capture and auto-reply bot, and integrated Meta Ads.

Go Fiber PostgreSQL Redis React TypeScript Tanstack Query WhatsApp API Meta Ads Clean Architecture

Frontend Developer – React JS & Next JS

Global Investa Capital

Jul 2023 - Aug 2025 (2 years 1 month)

Built dashboard systems for withdrawing, deposit, and trading using React and Next.js, and implemented state management with TanStack. Developed the One Core CRM application and wrote component documentation with Storybook.

React Next.js TanStack Storybook State Management Frontend Development

Backend Developer – Go & PHP

Global Investa Capital

Jul 2023 - Aug 2025 (2 years 1 month)

Developed REST APIs using Go Fiber and MySQL for blockchain data storage, and built microservices for email and notifications with RabbitMQ. Integrated third-party APIs like MT4/MT5 and built the OneCore CRM API.

Go PHP Fiber MySQL RabbitMQ Microservices REST APIs CRM

Mobile Developer

Damai Nusa Abadi

Jan 2023 - Jul 2023 (6 months)

Maintained the DMB application using Flutter and added features such as payment gateway integration with Xendit and point of sales. Developed the DMB Merchant app and integrated third-party APIs like Rajabiller for PPOB.

Flutter Xendit Payment Gateways Point of Sale API Integration

Fullstack Developer

PT Literasia Edutekno Digital

Oct 2021 - Dec 2022 (1 year 2 months)

Developed an E-Learning Management System using PHP Laravel and architected database systems with ERD. Built mobile applications with Flutter and deployed to Playstore, and developed APIs for Smart Village and TititkBaca.

PHP Laravel Flutter GetX MySQL API Development Database Design

Laboratory Assistant

University of North Sumatera

Aug 2019 - Jun 2021 (1 year 10 months)

Taught basic programming in C++, Java, and PHP, and implemented OOP concepts for mobile programming. Built and maintained an E-Learning web application using MySQL and Laravel 8.

C++Java PHP MySQL Laravel Object Oriented Programming Web Development

Education

Degrees, certifications, and relevant coursework

University of North Sumatera

Diploma, Informatic Engineering

2018 - 2021

Grade: 3.69/4.00

Activities and societies: Laboratory Assistant; Assistant Lecturer in C/C++, PHP, and Mobile Developer subjects.

Diploma in Informatic Engineering with a GPA of 3.69/4.00. Appointed as Laboratory Assistant and Assistant Lecturer, and developed an E-Learning system for students.